Examination lamp



C. T. BRADY EXAMINATION LAMP Aug. 7, 1928,

Filed May 31, 1927 "nun/"null Patented An. 7, i928.

' EXAMINATION LAMlP.-.

' y Application filed May 31,

The presentinvention pertains to a novel lamp constructed for-use in examination of objects such as parts of the body, documents, finger prints and the like.

The principal object of the invention is to provide a device of this character for throwing a restricted area of light on the object under examination and for promptly andrapidly enlarging this'area to a full flood when desired.

In the accomplishment of these objects, the lamp housing is fitted with a lens in one of the wallsv thereof, and over this lens is fitted a hinged cover having an aperture for reducing the diameter of the light shaft. The hinge connection between the cover and the housing includes a spring tending normally to remove-the cover from the lens, and a latch is provided for retaining the cover over the lens. WVhen it is desired to convertthe restricted area of light into a full flood, the latch is released and the spring in the hinge quicklymoves the cover away from the lens:

The cover is also adapted to support additional light-modifying devices on the outer surface thereof. One of these devices, for example, includes a tube containing a slidable condensing lens and a'fixed focusing lens, so thatthe intensity of the light projected upon the object may be varied at will.

The invention is fully disclosed by way of example in the following description and in the accompanying drawings, in which Figure 1 is a side elevation of the device;

Fig. 2 is a front view thereof; 7

Fig. 3 is a section on the line 3-3 of Figure 2; v V

Fig. t is a front elevation showing a modlfied form of lens support secured to the device; and 7 V Fig. 5 is a section on the line 5-5 of Figure 4.-

Reference to these views will now be made by use of like characters which are employed to designate corresponding parts throughout. V i r pp The numeral 1 represents a suitable pedestal having a lamp socket 2 mounted on the upper end thereof; A' Ll-shaped member 3 formed of a thin strip of metal is fixedito the upper end of the member 1 and'supports a lamp housing a having in its bottom an opening 5 enclosing the socket 1n such a manner that the latter' s not engaged by any partof the housingj' Thisarrangement 1927. Serial no. 195,571.-

reduces the conduction of heat from the housing to the socket, and conduction occurs only through the comparatively thin member 3 so that its effect is negligible.

The housing contains a lamp 6 fitted in the socket and is formed with vents 7 in the a pair of lateral ears 1'? aligning with the cars 15. A hinge pin 18 is passed through both sets of cars and is surrounded by'a spring 19 having one end 20 bearing against the door frame and the other end extended at 21 into engagement with the door whereby normally to hold the latter in open position. The door is however held in closed position by a spring latch 22 carried by the door frame.

The door.16 has a threaded aperture 23 preferably concentric with the lens 10. Into this aperture is screwed a tube 24 which reduces the shaft of light to a suitable diameter. When it is desired to have a flood of light rather than a restricted circle, the latch 22 is moved away from the door,

and the door is rapidly swung open by the action of the spring 18.

In Figures 4. and 5 is illustrated a construction wherein the light tube24l is replaced by'a set of lenses for further modifying or concentrating the light passed through the lens 10. This device includes a bell 25 from which extends a tube 26. The bell has a flange 27 formed with bayonet The door frame slots 28 and 29 adapted to engage studs 30 carried by the. door 16 for supporting the device. The slot 29 is elongated as shown in Figure a in order to accommodate the latch 22. A lens holder 31 is slidably mounted in the tube 26 and contains a condensing lens 32 in line with the aperture 23. In the forward end of the tube 26 is fitted a focusing lens 33. It will be apparent that the holder 31 may be conveniently adjusted in the tube 26 either prior to the application a of the device to the studs; 30 or subsequently by means of an object passed through the Ventionhas been illustrated and described, it Will be understood that various alterations in the details of constructionmay be made Without departing from the scope of the in- 10 Ventien as indicated by the appended claim.

- What I e1'a'im is: a

'A light comprisinga lamp housing, a lens thereof, an apertui'ed eowerimo v ably applied 'tosaid Wall and" adapted to overlie said lens, a hinge'joining said cover to said housing; said hinge including a spring tending to move the cover away from said lens, and a latch formaintaining said cover over said lens, said cover being adapted to sul port a light-modifying device around the aperture thereof.

In testimony whereof I' aflix my signatuize. 

